Ok, I wrote in german language because some other posts are in german also - sorry.
My english is not so good, so sorry for mistakes.

I create my first shop with joomshopping and now I have a question about the payment-methods.
I want to accept the usual creditcards and now I'm unsure what extension(s) I have to use:
concardis or ipayment or both?
What are the requirements for ipayment (do I need a 1&1 account to use it?)
Is concardis requred to use ipayment?
Can I work with the concardis-extension alone, or do I need any other payment-gateway then?